package com.jane.addressbook.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class SetCharacterEncoding implements Filter {
	private static Log log = LogFactory.getLog(SetCharacterEncoding.class);
	
	protected FilterConfig filterConfig = null;
	protected String encoding = null;

	public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;
		this.encoding = filterConfig.getInitParameter("encoding");
		log.debug("encoding -> " + this.encoding);
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		String encoding = this.encoding;
		if (encoding != null) {
			request.setCharacterEncoding(encoding);
			response.setCharacterEncoding(encoding);
		}
		log.debug("convert character encoding, encoding -> " + this.encoding);
		chain.doFilter(request, response);
	}

	public void destroy() {
		this.encoding = null;
		this.filterConfig = null;
	}
}